Bio-Rad CHEF-DR II System - Manual (Page 33)

6.2 Fuses
If the DC current during a run exceeds 500 mA entering the electrophoresis cell, the 0.5
ampere FB (fast blow) fuse will blow on the front panel of the drive module. Replace the
fuse by unscrewing the cartridge at the front of the drive module. Replace with 0.5 ampere FB
fuse (2 replacement fuses are provided). Make sure the drive module is off when replacing a
fuse.
A power surge may cause a SB (slow blow) line fuse to blow. The LED lights on the
front panel of either the drive module or the control module will go out. The line fuse is locat-
ed at the rear of each module. Control module: Replace the fuse with a 2.0 A SB if your line
voltage is 100 or 120 VAC, or a 1.0 A SB if your line voltage is 220 or 240 VAC.
Drive module: Replace the fuse with a 1.0 A SB if your line voltage is 100 or 120 VAC,
or a 0.5 A SB if your line voltage is 220 or 240 VAC. A 10 Amp fuse is used on the neutral
side for 100 and 120 VAC.
Replacement fuses are available from a variety of sources, including Radio Shack ® (Tandy
Corporation). The 0.5 A FB fuse (front panel of drive module) can be obtained as catalog
number 270-1241, the 1.0 A SB fuse (line fuse of drive module) as catalog number 270-1283,
and the 2.0 A SB fuse (line fuse of control module) as catalog number 270-1172 from Radio
Shack.
If the unit still does not operate, contact Bio-Rad Laboratories. Do not attempt to open and
repair the power module, or the warranty may be voided.
6.3 Maintenance of the Electrophoresis Cell
When the cell is not in use, even for short periods, all buffer should be removed to pre-
vent damage to the plastics. In addition, the lid should be left ajar to minimize possible
warpage.
Section 7
Troubleshooting Guide
Problem Solution
Equipment
No power to displays 1. Check line fuse at back of control module
or indicator lights 2. Check line fuse at back of drive module
3. Check source of A/C power
4. Contact Bio-Rad Laboratories
No voltage across 1. Check that lid is on
electrodes, with 2. Check that 24-pin serial cable is fully
AC power light on inserted at both ends
(left side of drive module) 3. Check that coiled interlock cable is firmly attached
4. Confirm that all leads are properly attached between
Control Module and Drive Module
5. Check lid interlock connection at electrophoresis
cell
6. Check HV fuse on front panel of drive module
(0.5 A FB) and replace if necessary
7. Check that the unit is not set in PAUSE mode
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